Edwaed claek



(No Model.)

B. CLARK.

STEAM BOILER FURNACE.

Patented Aug. 7, 1883.

INVENTOR WITNESSES: %7 MM ag JAM/ 55 been devised for effecting this purpose.

UNITED STATES PATENT \OFFICEO EDWARD CLARK, on NEW YORK, N. Y.

STEAM-BOILER FURNACE.

SPECIFIGATION forming part of Letters Patent No. 282,845, dated August '7, 1883.

' Application filed May 25,1883. (No model.)

T 0 all whom it may concern Be it known that I, EDWARD CLARK, a citizen of the United States, residing at New York, in the county of New York and State of. New York,have invented certain new and useful Improvements in Steam-Boiler Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention is especially adapted to the furnaces of steam-boilers, and especially that class of furnaces in which steam and air com bined are injected into the fire-chamber above the burning fuel for the purpose of promoting combustion. In practice it has been found that the best result is attained by heating the air before it is combined with the steam, and prior to my inventionvarious contrivanceshave All such devices, however, which are known to me are too complicated in construction and operation for adapting the same to general use and the object of my invention is to produce a device which shall be simple in its construction, and not only simple,but also economical inits operation, to which end it consists in the novel means hereinafter described, and illustrated in the accompanying drawings, in which- Figure 1 shows a furnace in longitudinal vertical section containing my improvement. Fig. 2 is a horizontal section thereof. Fig. 3 is a horizontal section of a portion of a vacuumchamber, forming the essential feature of my improvement. Fig. 4c is a vertical section there of, showing also aportio'n of thefurnace. Fig. 5 is a cross-section on thelinemw, Fig. 3. Fig. 6 is an end view.

Similar letters indicate similar parts.

The letter A designates the furnace of a steamlow stem or neck, E, which extends through the front wall of the furnace, it being suitably fastened therein, and opens onthe exterior of the furnace, where it is preferably furnished with a damper or valve, E, so that air may be admitted to the chamber Bthrough said stem.

pipe, F, into the chamber B. This pipe F ter- Through the hollow stem E extends a steamminates in jets G, which are opposite to the outlet-orifices O of the chamber B, they being equal in number to said orifices, and being,moreover,

supported by a bridge, H, in the chamber. In applying the apparatus to use the steampipe F is connected with the boiler or any other steam-supply source, and as the steam issues fromthe jets G a partial vacuum is thereby produced in the chamber B, causing the air to rush in through the hollow stem, so that currents of combined and hot air are injected into the furnace through the outlet-orifices C of the chamber in the required manner to commingle with the products of combustion in the furnace. It

will be seen that as the air passes through the ture to the required point for insuring the con-'- sumption of the gases in the furnace.

I am aware that a superheating-chamber has heretofore been arranged on the interior of a furnace, and also that steam-jets have been used in a vacuumchamber arranged on the ex terior of a furnace. With this vacuum-chamber, however, a separate heating medium for the air must be used, whereas in my apparatus the vacuum-chamber itself is utilized for this purpose, an advantage of which is, aside from economy, that a direct and entirely unobstructed inflow of air from the exterior of the furnace may be obtained.

Whatl claim, and desire to secure by Letters Patent, is

The combination, in a furnace, of the vacuum-chamber B, arranged on the interior of the into the external air, and provided with a In testimony whereof I affix my signature in [0 Valve, E, formed substantially as shown, for presence of two Witnesses. regulating the supply of air, of the steam-pipe F, passing through the hollow stem E, and ter- EDWVARD CLARK. 5 minating in two or more separate and distinct nozzle-pipes opposite the orifices O C, said 1102- Vit'nesses:

zle-pipes being securely supported in place by GEO. B. MoRRIs,

the bridge H, all constructed and operating J. F. LUDEWIG.

substantially in the manner described. 

